航空发动机风扇叶片抗近真实鸟体冲击响应分析

Anti Near-real Bird Body Impact Response Analysis of Aero-engine Fan Blade

在进行航空发动机风扇叶片鸟撞仿真分析时,一般将鸟体结构简化为圆柱体、胶囊体等规则模型进行计算,忽略了鸟体的真实生物结构特征,对最终的仿真结果会带来一定影响。为此,本文根据绿头鸭真实鸟体结构特征,构建了1.8 kg近真实鸟体的三维模型,采用有限元分析方法,开展了近真实鸟体在100 m/s的速度下撞击某型号涡轮风扇发动机叶片的动力学响应仿真分析研究。数值模拟结果表明:叶片在承受近真实鸟体撞击过程中轴向最大形变量达到叶片高度的14.3%,最大等效应力值达到了2000 Mpa,且主要集中在叶片前缘区域。

In the simulation analysis of bird impact on aero-engine fan blade,the bird body structure is generally simplified into regular model such as cylinder and capsule for calculation,ignoring the true biological structural characteristics of the bird body,which will have a certain impact on the final simulation results.Therefore,this paper constructs a 3D model of a 1.8 kg near-real bird body based on the structural characteristics of a mallard duck.The ANSYS/LS-DYNA finite element analysis method is used to conduct a simulation analysis of the dynamic response of a near-real bird body impacting a certain type of turbofan engine blade rotor at a speed of 100 m/s.The numerical simulation results show that the maximum axial deformation of the blade in the process of near-real bird body impact reaches 14.3%of the blade height,and the maximum equivalent stress value reaches 2000 Mpa,mainly concentrated at the leading edge of the blade.